A beautiful highly detailed digital artwork of a (Dark underground cave city. Intricate and abundant lightless archaic and barbaric navy blue architecture, resembling ancient ruins of some sort. Navy blue. Purple mica glistens beneath the surface of the subterranean river. Violet. The cave is illuminated only by bioluminescent plants. Crimson. It's dark and foreboding, but also whimsical and enticing), in the style of space nebula, with the colors of galaxies, featured on Artstation, octane render, 4k, 8k, artstationhq, intense, epic, exciting, wow, panoramic, cinematic, moody, hdri, lens flare, exciting, stop motion, highly detailed, octane render, soft lighting, celestial | Space